Unicode C

SSH Tunnel Listener Activity Log

Demonstrates the listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath, which record the activity of the background listener thread started by BeginAccepting.

Note: The log paths are relative to the application's current working directory. Absolute paths may also be used.

Background: Because the listener runs on a background thread, an activity log is often the only practical way to see what it is doing — which connections it accepted and when. KeepAcceptLog must be enabled for the in-memory AcceptLog to be populated; AcceptLogPath is an independent file-based log that persists across the run. This log covers the listener specifically, as distinct from the TunnelLog that records the SSH tunnel threads.

Chilkat Unicode C Downloads

Download Chilkat for Unicode C

Unicode C

#include <C_CkSshTunnelW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSshTunnelW tunnel;
    int sshPort;
    const wchar_t *password;
    int listenPort;
    BOOL waitForThreadExit;

    success = FALSE;

    //  Demonstrates the SshTunnel listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath.
    //  
    //  These log the activity of the background listener thread started by BeginAccepting.

    tunnel = CkSshTunnelW_Create();

    //  Retain the listener activity log in memory so it can be read from the AcceptLog property.
    CkSshTunnelW_putKeepAcceptLog(tunnel,TRUE);

    //  Optionally also write the listener activity to a file (separate from the in-memory log).
    CkSshTunnelW_putAcceptLogPath(tunnel,L"qa_output/accept.log");

    CkSshTunnelW_putDestHostname(tunnel,L"db.internal.example.com");
    CkSshTunnelW_putDestPort(tunnel,5432);

    sshPort = 22;
    success = CkSshTunnelW_Connect(tunnel,L"ssh.example.com",sshPort);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkSshTunnelW_Dispose(tunnel);
        return;
    }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    password = L"mySshPassword";

    success = CkSshTunnelW_AuthenticatePw(tunnel,L"mySshLogin",password);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkSshTunnelW_Dispose(tunnel);
        return;
    }

    listenPort = 1080;
    success = CkSshTunnelW_BeginAccepting(tunnel,listenPort);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkSshTunnelW_Dispose(tunnel);
        return;
    }

    //  ... the listener accepts connections for a while ...

    //  Read the accumulated in-memory listener log.
    wprintf(L"%s\n",CkSshTunnelW_acceptLog(tunnel));

    waitForThreadExit = TRUE;
    success = CkSshTunnelW_CloseTunnel(tunnel,waitForThreadExit);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkSshTunnelW_Dispose(tunnel);
        return;
    }



    CkSshTunnelW_Dispose(tunnel);

    }